# Compressed Air - Pressure Drop Diagrams in Metric Units

## Pressure drop in compressed air pipe lines

Compressed air pipeline pressure drop in kg/m2 per 100 m pipe can be estimated for typical entering pressures in the diagrams below. The diagrams are calculated for schedule 40 pipes.

Other dimensions or pressures can be calculated with the

### Compressed Air Entering Pressure 5 kg/cm2

• 1 kg/cm2 = 0.98 bar = 735 mmHg = 10000 mmH2O = 14.2 psi
• 1 m3/min = 0.017 m3/s = 60 m3/h = 1000 liter/min = 35.3 cfm
• 1 m (meter) = 3.2808 ft = 39.37 in

### Compressed air pressure drop for pipes other than Schedule 40

Compressed air pressure drop in pipes other than schedule 40 can be calculated as

dp = dp40 (d40 / d)5                                                      (1)

where

dp = actual pressure drop (bar per 100 m pipe)

dp40 = pressure drop in schedule 40 pipe from the table or diagram above (bar per 100 m pipe)

d40 = inside diameter schedule 40 pipe (inches)

d = actual inside diameter (inches)

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